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Diffstat (limited to 'src/df.c')
| -rw-r--r-- | src/df.c | 1847 |
1 files changed, 1847 insertions, 0 deletions
diff --git a/src/df.c b/src/df.c new file mode 100644 index 0000000..5fa1a58 --- /dev/null +++ b/src/df.c @@ -0,0 +1,1847 @@ +/* df - summarize free disk space + Copyright (C) 1991-2020 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. + --human-readable option added by lm@sgi.com. + --si and large file support added by eggert@twinsun.com. */ + +#include <config.h> +#include <stdio.h> +#include <sys/types.h> +#include <getopt.h> +#include <assert.h> +#include <c-ctype.h> +#include <wchar.h> +#include <wctype.h> + +#include "system.h" +#include "canonicalize.h" +#include "die.h" +#include "error.h" +#include "fsusage.h" +#include "human.h" +#include "mbsalign.h" +#include "mbswidth.h" +#include "mountlist.h" +#include "quote.h" +#include "find-mount-point.h" +#include "hash.h" +#include "xstrtol-error.h" + +/* The official name of this program (e.g., no 'g' prefix). */ +#define PROGRAM_NAME "df" + +#define AUTHORS \ + proper_name ("Torbjorn Granlund"), \ + proper_name ("David MacKenzie"), \ + proper_name ("Paul Eggert") + +struct devlist +{ + dev_t dev_num; + struct mount_entry *me; + struct devlist *next; +}; + +/* Filled with device numbers of examined file systems to avoid + duplicates in output. */ +static Hash_table *devlist_table; + +/* If true, show even file systems with zero size or + uninteresting types. */ +static bool show_all_fs; + +/* If true, show only local file systems. */ +static bool show_local_fs; + +/* If true, output data for each file system corresponding to a + command line argument -- even if it's a dummy (automounter) entry. */ +static bool show_listed_fs; + +/* Human-readable options for output. */ +static int human_output_opts; + +/* The units to use when printing sizes. */ +static uintmax_t output_block_size; + +/* True if a file system has been processed for output. */ +static bool file_systems_processed; + +/* If true, invoke the 'sync' system call before getting any usage data. + Using this option can make df very slow, especially with many or very + busy disks. Note that this may make a difference on some systems -- + SunOS 4.1.3, for one. It is *not* necessary on GNU/Linux. */ +static bool require_sync; + +/* Desired exit status. */ +static int exit_status; + +/* A file system type to display. */ + +struct fs_type_list +{ + char *fs_name; + struct fs_type_list *fs_next; +}; + +/* Linked list of file system types to display. + If 'fs_select_list' is NULL, list all types. + This table is generated dynamically from command-line options, + rather than hardcoding into the program what it thinks are the + valid file system types; let the user specify any file system type + they want to, and if there are any file systems of that type, they + will be shown. + + Some file system types: + 4.2 4.3 ufs nfs swap ignore io vm efs dbg */ + +static struct fs_type_list *fs_select_list; + +/* Linked list of file system types to omit. + If the list is empty, don't exclude any types. */ + +static struct fs_type_list *fs_exclude_list; + +/* Linked list of mounted file systems. */ +static struct mount_entry *mount_list; + +/* If true, print file system type as well. */ +static bool print_type; + +/* If true, print a grand total at the end. */ +static bool print_grand_total; + +/* Grand total data. */ +static struct fs_usage grand_fsu; + +/* Display modes. */ +enum +{ + DEFAULT_MODE, + INODES_MODE, + HUMAN_MODE, + POSIX_MODE, + OUTPUT_MODE +}; +static int header_mode = DEFAULT_MODE; + +/* Displayable fields. */ +typedef enum +{ + SOURCE_FIELD, /* file system */ + FSTYPE_FIELD, /* FS type */ + SIZE_FIELD, /* FS size */ + USED_FIELD, /* FS size used */ + AVAIL_FIELD, /* FS size available */ + PCENT_FIELD, /* percent used */ + ITOTAL_FIELD, /* inode total */ + IUSED_FIELD, /* inodes used */ + IAVAIL_FIELD, /* inodes available */ + IPCENT_FIELD, /* inodes used in percent */ + TARGET_FIELD, /* mount point */ + FILE_FIELD, /* specified file name */ + INVALID_FIELD /* validation marker */ +} display_field_t; + +/* Flag if a field contains a block, an inode or another value. */ +typedef enum +{ + BLOCK_FLD, /* Block values field */ + INODE_FLD, /* Inode values field */ + OTHER_FLD /* Neutral field, e.g. target */ +} field_type_t; + +/* Attributes of a display field. */ +struct field_data_t +{ + display_field_t field; + char const *arg; + field_type_t field_type; + const char *caption;/* NULL means to use the default header of this field. */ + size_t width; /* Auto adjusted (up) widths used to align columns. */ + mbs_align_t align; /* Alignment for this field. */ + bool used; +}; + +/* Header strings, minimum width and alignment for the above fields. */ +static struct field_data_t field_data[] = { + [SOURCE_FIELD] = { SOURCE_FIELD, + "source", OTHER_FLD, N_("Filesystem"), 14, MBS_ALIGN_LEFT, false }, + + [FSTYPE_FIELD] = { FSTYPE_FIELD, + "fstype", OTHER_FLD, N_("Type"), 4, MBS_ALIGN_LEFT, false }, + + [SIZE_FIELD] = { SIZE_FIELD, + "size", BLOCK_FLD, N_("blocks"), 5, MBS_ALIGN_RIGHT, false }, + + [USED_FIELD] = { USED_FIELD, + "used", BLOCK_FLD, N_("Used"), 5, MBS_ALIGN_RIGHT, false }, + + [AVAIL_FIELD] = { AVAIL_FIELD, + "avail", BLOCK_FLD, N_("Available"), 5, MBS_ALIGN_RIGHT, false }, + + [PCENT_FIELD] = { PCENT_FIELD, + "pcent", BLOCK_FLD, N_("Use%"), 4, MBS_ALIGN_RIGHT, false }, + + [ITOTAL_FIELD] = { ITOTAL_FIELD, + "itotal", INODE_FLD, N_("Inodes"), 5, MBS_ALIGN_RIGHT, false }, + + [IUSED_FIELD] = { IUSED_FIELD, + "iused", INODE_FLD, N_("IUsed"), 5, MBS_ALIGN_RIGHT, false }, + + [IAVAIL_FIELD] = { IAVAIL_FIELD, + "iavail", INODE_FLD, N_("IFree"), 5, MBS_ALIGN_RIGHT, false }, + + [IPCENT_FIELD] = { IPCENT_FIELD, + "ipcent", INODE_FLD, N_("IUse%"), 4, MBS_ALIGN_RIGHT, false }, + + [TARGET_FIELD] = { TARGET_FIELD, + "target", OTHER_FLD, N_("Mounted on"), 0, MBS_ALIGN_LEFT, false }, + + [FILE_FIELD] = { FILE_FIELD, + "file", OTHER_FLD, N_("File"), 0, MBS_ALIGN_LEFT, false } +}; + +static char const *all_args_string = + "source,fstype,itotal,iused,iavail,ipcent,size," + "used,avail,pcent,file,target"; + +/* Storage for the definition of output columns. */ +static struct field_data_t **columns; + +/* The current number of output columns. */ +static size_t ncolumns; + +/* Field values. */ +struct field_values_t +{ + uintmax_t input_units; + uintmax_t output_units; + uintmax_t total; + uintmax_t available; + bool negate_available; + uintmax_t available_to_root; + uintmax_t used; + bool negate_used; +}; + +/* Storage for pointers for each string (cell of table). */ +static char ***table; + +/* The current number of processed rows (including header). */ +static size_t nrows; + +/* For long options that have no equivalent short option, use a + non-character as a pseudo short option, starting with CHAR_MAX + 1. */ +enum +{ + NO_SYNC_OPTION = CHAR_MAX + 1, + SYNC_OPTION, + TOTAL_OPTION, + OUTPUT_OPTION +}; + +static struct option const long_options[] = +{ + {"all", no_argument, NULL, 'a'}, + {"block-size", required_argument, NULL, 'B'}, + {"inodes", no_argument, NULL, 'i'}, + {"human-readable", no_argument, NULL, 'h'}, + {"si", no_argument, NULL, 'H'}, + {"local", no_argument, NULL, 'l'}, + {"output", optional_argument, NULL, OUTPUT_OPTION}, + {"portability", no_argument, NULL, 'P'}, + {"print-type", no_argument, NULL, 'T'}, + {"sync", no_argument, NULL, SYNC_OPTION}, + {"no-sync", no_argument, NULL, NO_SYNC_OPTION}, + {"total", no_argument, NULL, TOTAL_OPTION}, + {"type", required_argument, NULL, 't'}, + {"exclude-type", required_argument, NULL, 'x'}, + {GETOPT_HELP_OPTION_DECL}, + {GETOPT_VERSION_OPTION_DECL}, + {NULL, 0, NULL, 0} +}; + +/* Replace problematic chars with '?'. + Since only control characters are currently considered, + this should work in all encodings. */ + +static void +replace_control_chars (char *cell) +{ + char *p = cell; + while (*p) + { + if (c_iscntrl (to_uchar (*p))) + *p = '?'; + p++; + } +} + +/* Replace problematic chars with '?'. */ + +static void +replace_invalid_chars (char *cell) +{ + char *srcend = cell + strlen (cell); + char *dst = cell; + mbstate_t mbstate = { 0, }; + size_t n; + + for (char *src = cell; src != srcend; src += n) + { + wchar_t wc; + size_t srcbytes = srcend - src; + n = mbrtowc (&wc, src, srcbytes, &mbstate); + bool ok = n <= srcbytes; + + if (ok) + ok = !iswcntrl (wc); + else + n = 1; + + if (ok) + { + memmove (dst, src, n); + dst += n; + } + else + { + *dst++ = '?'; + memset (&mbstate, 0, sizeof mbstate); + } + } + + *dst = '\0'; +} + +static void +replace_problematic_chars (char *cell) +{ + static int tty_out = -1; + if (tty_out < 0) + tty_out = isatty (STDOUT_FILENO); + + (tty_out ? replace_invalid_chars : replace_control_chars) (cell) ; +} + + +/* Dynamically allocate a row of pointers in TABLE, which + can then be accessed with standard 2D array notation. */ + +static void +alloc_table_row (void) +{ + nrows++; + table = xnrealloc (table, nrows, sizeof (char **)); + table[nrows - 1] = xnmalloc (ncolumns, sizeof (char *)); +} + +/* Output each cell in the table, accounting for the + alignment and max width of each column. */ + +static void +print_table (void) +{ + size_t row; + + for (row = 0; row < nrows; row++) + { + size_t col; + for (col = 0; col < ncolumns; col++) + { + char *cell = table[row][col]; + + /* Note the SOURCE_FIELD used to be displayed on it's own line + if (!posix_format && mbswidth (cell) > 20), but that + functionality was probably more problematic than helpful, + hence changed in commit v8.10-40-g99679ff. */ + if (col != 0) + putchar (' '); + + int flags = 0; + if (col == ncolumns - 1) /* The last one. */ + flags = MBA_NO_RIGHT_PAD; + + size_t width = columns[col]->width; + cell = ambsalign (cell, &width, columns[col]->align, flags); + /* When ambsalign fails, output unaligned data. */ + fputs (cell ? cell : table[row][col], stdout); + free (cell); + + IF_LINT (free (table[row][col])); + } + putchar ('\n'); + IF_LINT (free (table[row])); + } + + IF_LINT (free (table)); +} + +/* Dynamically allocate a struct field_t in COLUMNS, which + can then be accessed with standard array notation. */ + +static void +alloc_field (int f, const char *c) +{ + ncolumns++; + columns = xnrealloc (columns, ncolumns, sizeof (struct field_data_t *)); + columns[ncolumns - 1] = &field_data[f]; + if (c != NULL) + columns[ncolumns - 1]->caption = c; + + if (field_data[f].used) + assert (!"field used"); + + /* Mark field as used. */ + field_data[f].used = true; +} + + +/* Given a string, ARG, containing a comma-separated list of arguments + to the --output option, add the appropriate fields to columns. */ +static void +decode_output_arg (char const *arg) +{ + char *arg_writable = xstrdup (arg); + char *s = arg_writable; + do + { + /* find next comma */ + char *comma = strchr (s, ','); + + /* If we found a comma, put a NUL in its place and advance. */ + if (comma) + *comma++ = 0; + + /* process S. */ + display_field_t field = INVALID_FIELD; + for (unsigned int i = 0; i < ARRAY_CARDINALITY (field_data); i++) + { + if (STREQ (field_data[i].arg, s)) + { + field = i; + break; + } + } + if (field == INVALID_FIELD) + { + error (0, 0, _("option --output: field %s unknown"), quote (s)); + usage (EXIT_FAILURE); + } + + if (field_data[field].used) + { + /* Prevent the fields from being used more than once. */ + error (0, 0, _("option --output: field %s used more than once"), + quote (field_data[field].arg)); + usage (EXIT_FAILURE); + } + + switch (field) + { + case SOURCE_FIELD: + case FSTYPE_FIELD: + case USED_FIELD: + case PCENT_FIELD: + case ITOTAL_FIELD: + case IUSED_FIELD: + case IAVAIL_FIELD: + case IPCENT_FIELD: + case TARGET_FIELD: + case FILE_FIELD: + alloc_field (field, NULL); + break; + + case SIZE_FIELD: + alloc_field (field, N_("Size")); + break; + + case AVAIL_FIELD: + alloc_field (field, N_("Avail")); + break; + + default: + assert (!"invalid field"); + } + s = comma; + } + while (s); + + free (arg_writable); +} + +/* Get the appropriate columns for the mode. */ +static void +get_field_list (void) +{ + switch (header_mode) + { + case DEFAULT_MODE: + alloc_field (SOURCE_FIELD, NULL); + if (print_type) + alloc_field (FSTYPE_FIELD, NULL); + alloc_field (SIZE_FIELD, NULL); + alloc_field (USED_FIELD, NULL); + alloc_field (AVAIL_FIELD, NULL); + alloc_field (PCENT_FIELD, NULL); + alloc_field (TARGET_FIELD, NULL); + break; + + case HUMAN_MODE: + alloc_field (SOURCE_FIELD, NULL); + if (print_type) + alloc_field (FSTYPE_FIELD, NULL); + + alloc_field (SIZE_FIELD, N_("Size")); + alloc_field (USED_FIELD, NULL); + alloc_field (AVAIL_FIELD, N_("Avail")); + alloc_field (PCENT_FIELD, NULL); + alloc_field (TARGET_FIELD, NULL); + break; + + case INODES_MODE: + alloc_field (SOURCE_FIELD, NULL); + if (print_type) + alloc_field (FSTYPE_FIELD, NULL); + alloc_field (ITOTAL_FIELD, NULL); + alloc_field (IUSED_FIELD, NULL); + alloc_field (IAVAIL_FIELD, NULL); + alloc_field (IPCENT_FIELD, NULL); + alloc_field (TARGET_FIELD, NULL); + break; + + case POSIX_MODE: + alloc_field (SOURCE_FIELD, NULL); + if (print_type) + alloc_field (FSTYPE_FIELD, NULL); + alloc_field (SIZE_FIELD, NULL); + alloc_field (USED_FIELD, NULL); + alloc_field (AVAIL_FIELD, NULL); + alloc_field (PCENT_FIELD, N_("Capacity")); + alloc_field (TARGET_FIELD, NULL); + break; + + case OUTPUT_MODE: + if (!ncolumns) + { + /* Add all fields if --output was given without a field list. */ + decode_output_arg (all_args_string); + } + break; + + default: + assert (!"invalid header_mode"); + } +} + +/* Obtain the appropriate header entries. */ + +static void +get_header (void) +{ + size_t col; + + alloc_table_row (); + + for (col = 0; col < ncolumns; col++) + { + char *cell = NULL; + char const *header = _(columns[col]->caption); + + if (columns[col]->field == SIZE_FIELD + && (header_mode == DEFAULT_MODE + || (header_mode == OUTPUT_MODE + && !(human_output_opts & human_autoscale)))) + { + char buf[LONGEST_HUMAN_READABLE + 1]; + + int opts = (human_suppress_point_zero + | human_autoscale | human_SI + | (human_output_opts + & (human_group_digits | human_base_1024 | human_B))); + + /* Prefer the base that makes the human-readable value more exact, + if there is a difference. */ + + uintmax_t q1000 = output_block_size; + uintmax_t q1024 = output_block_size; + bool divisible_by_1000; + bool divisible_by_1024; + + do + { + divisible_by_1000 = q1000 % 1000 == 0; q1000 /= 1000; + divisible_by_1024 = q1024 % 1024 == 0; q1024 /= 1024; + } + while (divisible_by_1000 & divisible_by_1024); + + if (divisible_by_1000 < divisible_by_1024) + opts |= human_base_1024; + if (divisible_by_1024 < divisible_by_1000) + opts &= ~human_base_1024; + if (! (opts & human_base_1024)) + opts |= human_B; + + char *num = human_readable (output_block_size, buf, opts, 1, 1); + + /* Reset the header back to the default in OUTPUT_MODE. */ + header = _("blocks"); + + /* TRANSLATORS: this is the "1K-blocks" header in "df" output. */ + if (asprintf (&cell, _("%s-%s"), num, header) == -1) + cell = NULL; + } + else if (header_mode == POSIX_MODE && columns[col]->field == SIZE_FIELD) + { + char buf[INT_BUFSIZE_BOUND (uintmax_t)]; + char *num = umaxtostr (output_block_size, buf); + + /* TRANSLATORS: this is the "1024-blocks" header in "df -P". */ + if (asprintf (&cell, _("%s-%s"), num, header) == -1) + cell = NULL; + } + else + cell = strdup (header); + + if (!cell) + xalloc_die (); + + replace_problematic_chars (cell); + + table[nrows - 1][col] = cell; + + size_t cell_width = mbswidth (cell, 0); + columns[col]->width = MAX (columns[col]->width, cell_width); + } +} + +/* Is FSTYPE a type of file system that should be listed? */ + +static bool _GL_ATTRIBUTE_PURE +selected_fstype (const char *fstype) +{ + const struct fs_type_list *fsp; + + if (fs_select_list == NULL || fstype == NULL) + return true; + for (fsp = fs_select_list; fsp; fsp = fsp->fs_next) + if (STREQ (fstype, fsp->fs_name)) + return true; + return false; +} + +/* Is FSTYPE a type of file system that should be omitted? */ + +static bool _GL_ATTRIBUTE_PURE +excluded_fstype (const char *fstype) +{ + const struct fs_type_list *fsp; + + if (fs_exclude_list == NULL || fstype == NULL) + return false; + for (fsp = fs_exclude_list; fsp; fsp = fsp->fs_next) + if (STREQ (fstype, fsp->fs_name)) + return true; + return false; +} + +static size_t +devlist_hash (void const *x, size_t table_size) +{ + struct devlist const *p = x; + return (uintmax_t) p->dev_num % table_size; +} + +static bool +devlist_compare (void const *x, void const *y) +{ + struct devlist const *a = x; + struct devlist const *b = y; + return a->dev_num == b->dev_num; +} + +static struct devlist * +devlist_for_dev (dev_t dev) +{ + if (devlist_table == NULL) + return NULL; + struct devlist dev_entry; + dev_entry.dev_num = dev; + return hash_lookup (devlist_table, &dev_entry); +} + +static void +devlist_free (void *p) +{ + free (p); +} + +/* Filter mount list by skipping duplicate entries. + In the case of duplicates - based on the device number - the mount entry + with a '/' in its me_devname (i.e., not pseudo name like tmpfs) wins. + If both have a real devname (e.g. bind mounts), then that with the shorter + me_mountdir wins. With DEVICES_ONLY == true (set with df -a), only update + the global devlist_table, rather than filtering the global mount_list. */ + +static void +filter_mount_list (bool devices_only) +{ + struct mount_entry *me; + + /* Temporary list to keep entries ordered. */ + struct devlist *device_list = NULL; + int mount_list_size = 0; + + for (me = mount_list; me; me = me->me_next) + mount_list_size++; + + devlist_table = hash_initialize (mount_list_size, NULL, + devlist_hash, + devlist_compare, + devlist_free); + if (devlist_table == NULL) + xalloc_die (); + + /* Sort all 'wanted' entries into the list device_list. */ + for (me = mount_list; me;) + { + struct stat buf; + struct mount_entry *discard_me = NULL; + + /* Avoid stating remote file systems as that may hang. + On Linux we probably have me_dev populated from /proc/self/mountinfo, + however we still stat() in case another device was mounted later. */ + if ((me->me_remote && show_local_fs) + || (me->me_dummy && !show_all_fs && !show_listed_fs) + || (!selected_fstype (me->me_type) || excluded_fstype (me->me_type)) + || -1 == stat (me->me_mountdir, &buf)) + { + /* If remote, and showing just local, or FS type is excluded, + add ME for filtering later. + If stat failed; add ME to be able to complain about it later. */ + buf.st_dev = me->me_dev; + } + else + { + /* If we've already seen this device... */ + struct devlist *seen_dev = devlist_for_dev (buf.st_dev); + + if (seen_dev) + { + bool target_nearer_root = strlen (seen_dev->me->me_mountdir) + > strlen (me->me_mountdir); + /* With bind mounts, prefer items nearer the root of the source */ + bool source_below_root = seen_dev->me->me_mntroot != NULL + && me->me_mntroot != NULL + && (strlen (seen_dev->me->me_mntroot) + < strlen (me->me_mntroot)); + if (! print_grand_total + && me->me_remote && seen_dev->me->me_remote + && ! STREQ (seen_dev->me->me_devname, me->me_devname)) + { + /* Don't discard remote entries with different locations, + as these are more likely to be explicitly mounted. + However avoid this when producing a total to give + a more accurate value in that case. */ + } + else if ((strchr (me->me_devname, '/') + /* let "real" devices with '/' in the name win. */ + && ! strchr (seen_dev->me->me_devname, '/')) + /* let points towards the root of the device win. */ + || (target_nearer_root && ! source_below_root) + /* let an entry overmounted on a new device win... */ + || (! STREQ (seen_dev->me->me_devname, me->me_devname) + /* ... but only when matching an existing mnt point, + to avoid problematic replacement when given + inaccurate mount lists, seen with some chroot + environments for example. */ + && STREQ (me->me_mountdir, + seen_dev->me->me_mountdir))) + { + /* Discard mount entry for existing device. */ + discard_me = seen_dev->me; + seen_dev->me = me; + } + else + { + /* Discard mount entry currently being processed. */ + discard_me = me; + } + + } + } + + if (discard_me) + { + me = me->me_next; + if (! devices_only) + free_mount_entry (discard_me); + } + else + { + /* Add the device number to the device_table. */ + struct devlist *devlist = xmalloc (sizeof *devlist); + devlist->me = me; + devlist->dev_num = buf.st_dev; + devlist->next = device_list; + device_list = devlist; + if (hash_insert (devlist_table, devlist) == NULL) + xalloc_die (); + + me = me->me_next; + } + } + + /* Finally rebuild the mount_list from the devlist. */ + if (! devices_only) { + mount_list = NULL; + while (device_list) + { + /* Add the mount entry. */ + me = device_list->me; + me->me_next = mount_list; + mount_list = me; + device_list = device_list->next; + } + + hash_free (devlist_table); + devlist_table = NULL; + } +} + + +/* Search a mount entry list for device id DEV. + Return the corresponding mount entry if found or NULL if not. */ + +static struct mount_entry const * _GL_ATTRIBUTE_PURE +me_for_dev (dev_t dev) +{ + struct devlist *dl = devlist_for_dev (dev); + if (dl) + return dl->me; + + return NULL; +} + +/* Return true if N is a known integer value. On many file systems, + UINTMAX_MAX represents an unknown value; on AIX, UINTMAX_MAX - 1 + represents unknown. Use a rule that works on AIX file systems, and + that almost-always works on other types. */ +static bool +known_value (uintmax_t n) +{ + return n < UINTMAX_MAX - 1; +} + +/* Like human_readable (N, BUF, human_output_opts, INPUT_UNITS, OUTPUT_UNITS), + except: + + - If NEGATIVE, then N represents a negative number, + expressed in two's complement. + - Otherwise, return "-" if N is unknown. */ + +static char const * +df_readable (bool negative, uintmax_t n, char *buf, + uintmax_t input_units, uintmax_t output_units) +{ + if (! known_value (n) && !negative) + return "-"; + else + { + char *p = human_readable (negative ? -n : n, buf + negative, + human_output_opts, input_units, output_units); + if (negative) + *--p = '-'; + return p; + } +} + +/* Logical equivalence */ +#define LOG_EQ(a, b) (!(a) == !(b)) + +/* Add integral value while using uintmax_t for value part and separate + negation flag. It adds value of SRC and SRC_NEG to DEST and DEST_NEG. + The result will be in DEST and DEST_NEG. See df_readable to understand + how the negation flag is used. */ +static void +add_uint_with_neg_flag (uintmax_t *dest, bool *dest_neg, + uintmax_t src, bool src_neg) +{ + if (LOG_EQ (*dest_neg, src_neg)) + { + *dest += src; + return; + } + + if (*dest_neg) + *dest = -*dest; + + if (src_neg) + src = -src; + + if (src < *dest) + *dest -= src; + else + { + *dest = src - *dest; + *dest_neg = src_neg; + } + + if (*dest_neg) + *dest = -*dest; +} + +/* Return true if S ends in a string that may be a 36-byte UUID, + i.e., of the form HHHHHHHH-HHHH-HHHH-HHHH-HHHHHHHHHHHH, where + each H is an upper or lower case hexadecimal digit. */ +static bool _GL_ATTRIBUTE_PURE +has_uuid_suffix (char const *s) +{ + size_t len = strlen (s); + return (36 < len + && strspn (s + len - 36, "-0123456789abcdefABCDEF") == 36); +} + +/* Obtain the block values BV and inode values IV + from the file system usage FSU. */ +static void +get_field_values (struct field_values_t *bv, + struct field_values_t *iv, + const struct fs_usage *fsu) +{ + /* Inode values. */ + iv->input_units = iv->output_units = 1; + iv->total = fsu->fsu_files; + iv->available = iv->available_to_root = fsu->fsu_ffree; + iv->negate_available = false; + + iv->used = UINTMAX_MAX; + iv->negate_used = false; + if (known_value (iv->total) && known_value (iv->available_to_root)) + { + iv->used = iv->total - iv->available_to_root; + iv->negate_used = (iv->total < iv->available_to_root); + } + + /* Block values. */ + bv->input_units = fsu->fsu_blocksize; + bv->output_units = output_block_size; + bv->total = fsu->fsu_blocks; + bv->available = fsu->fsu_bavail; + bv->available_to_root = fsu->fsu_bfree; + bv->negate_available = (fsu->fsu_bavail_top_bit_set + && known_value (fsu->fsu_bavail)); + + bv->used = UINTMAX_MAX; + bv->negate_used = false; + if (known_value (bv->total) && known_value (bv->available_to_root)) + { + bv->used = bv->total - bv->available_to_root; + bv->negate_used = (bv->total < bv->available_to_root); + } +} + +/* Add block and inode values to grand total. */ +static void +add_to_grand_total (struct field_values_t *bv, struct field_values_t *iv) +{ + if (known_value (iv->total)) + grand_fsu.fsu_files += iv->total; + if (known_value (iv->available)) + grand_fsu.fsu_ffree += iv->available; + + if (known_value (bv->total)) + grand_fsu.fsu_blocks += bv->input_units * bv->total; + if (known_value (bv->available_to_root)) + grand_fsu.fsu_bfree += bv->input_units * bv->available_to_root; + if (known_value (bv->available)) + add_uint_with_neg_flag (&grand_fsu.fsu_bavail, + &grand_fsu.fsu_bavail_top_bit_set, + bv->input_units * bv->available, + bv->negate_available); +} + +/* Obtain a space listing for the disk device with absolute file name DISK. + If MOUNT_POINT is non-NULL, it is the name of the root of the + file system on DISK. + If STAT_FILE is non-null, it is the name of a file within the file + system that the user originally asked for; this provides better + diagnostics, and sometimes it provides better results on networked + file systems that give different free-space results depending on + where in the file system you probe. + If FSTYPE is non-NULL, it is the type of the file system on DISK. + If MOUNT_POINT is non-NULL, then DISK may be NULL -- certain systems may + not be able to produce statistics in this case. + ME_DUMMY and ME_REMOTE are the mount entry flags. + Caller must set PROCESS_ALL to true when iterating over all entries, as + when df is invoked with no non-option argument. See below for details. */ + +static void +get_dev (char const *disk, char const *mount_point, char const* file, + char const *stat_file, char const *fstype, + bool me_dummy, bool me_remote, + const struct fs_usage *force_fsu, + bool process_all) +{ + if (me_remote && show_local_fs) + return; + + if (me_dummy && !show_all_fs && !show_listed_fs) + return; + + if (!selected_fstype (fstype) || excluded_fstype (fstype)) + return; + + /* Ignore relative MOUNT_POINTs, which are present for example + in /proc/mounts on Linux with network namespaces. */ + if (!force_fsu && mount_point && ! IS_ABSOLUTE_FILE_NAME (mount_point)) + return; + + /* If MOUNT_POINT is NULL, then the file system is not mounted, and this + program reports on the file system that the special file is on. + It would be better to report on the unmounted file system, + but statfs doesn't do that on most systems. */ + if (!stat_file) + stat_file = mount_point ? mount_point : disk; + + struct fs_usage fsu; + if (force_fsu) + fsu = *force_fsu; + else if (get_fs_usage (stat_file, disk, &fsu)) + { + /* If we can't access a system provided entry due + to it not being present (now), or due to permissions, + just output placeholder values rather than failing. */ + if (process_all && (errno == EACCES || errno == ENOENT)) + { + if (! show_all_fs) + return; + + fstype = "-"; + fsu.fsu_bavail_top_bit_set = false; + fsu.fsu_blocksize = fsu.fsu_blocks = fsu.fsu_bfree = + fsu.fsu_bavail = fsu.fsu_files = fsu.fsu_ffree = UINTMAX_MAX; + } + else + { + error (0, errno, "%s", quotef (stat_file)); + exit_status = EXIT_FAILURE; + return; + } + } + else if (process_all && show_all_fs) + { + /* Ensure we don't output incorrect stats for over-mounted directories. + Discard stats when the device name doesn't match. Though don't + discard when used and current mount entries are both remote due + to the possibility of aliased host names or exports. */ + struct stat sb; + if (stat (stat_file, &sb) == 0) + { + struct mount_entry const * dev_me = me_for_dev (sb.st_dev); + if (dev_me && ! STREQ (dev_me->me_devname, disk) + && (! dev_me->me_remote || ! me_remote)) + { + fstype = "-"; + fsu.fsu_bavail_top_bit_set = false; + fsu.fsu_blocksize = fsu.fsu_blocks = fsu.fsu_bfree = + fsu.fsu_bavail = fsu.fsu_files = fsu.fsu_ffree = UINTMAX_MAX; + } + } + } + + if (fsu.fsu_blocks == 0 && !show_all_fs && !show_listed_fs) + return; + + if (! force_fsu) + file_systems_processed = true; + + alloc_table_row (); + + if (! disk) + disk = "-"; /* unknown */ + + if (! file) + file = "-"; /* unspecified */ + + char *dev_name = xstrdup (disk); + char *resolved_dev; + + /* On some systems, dev_name is a long-named symlink like + /dev/disk/by-uuid/828fc648-9f30-43d8-a0b1-f7196a2edb66 pointing to a + much shorter and more useful name like /dev/sda1. It may also look + like /dev/mapper/luks-828fc648-9f30-43d8-a0b1-f7196a2edb66 and point to + /dev/dm-0. When process_all is true and dev_name is a symlink whose + name ends with a UUID use the resolved name instead. */ + if (process_all + && has_uuid_suffix (dev_name) + && (resolved_dev = canonicalize_filename_mode (dev_name, CAN_EXISTING))) + { + free (dev_name); + dev_name = resolved_dev; + } + + if (! fstype) + fstype = "-"; /* unknown */ + + struct field_values_t block_values; + struct field_values_t inode_values; + get_field_values (&block_values, &inode_values, &fsu); + + /* Add to grand total unless processing grand total line. */ + if (print_grand_total && ! force_fsu) + add_to_grand_total (&block_values, &inode_values); + + size_t col; + for (col = 0; col < ncolumns; col++) + { + char buf[LONGEST_HUMAN_READABLE + 2]; + char *cell; + + struct field_values_t *v; + switch (columns[col]->field_type) + { + case BLOCK_FLD: + v = &block_values; + break; + case INODE_FLD: + v = &inode_values; + break; + case OTHER_FLD: + v = NULL; + break; + default: + v = NULL; /* Avoid warnings where assert() is not __noreturn__. */ + assert (!"bad field_type"); + } + + switch (columns[col]->field) + { + case SOURCE_FIELD: + cell = xstrdup (dev_name); + break; + + case FSTYPE_FIELD: + cell = xstrdup (fstype); + break; + + case SIZE_FIELD: + case ITOTAL_FIELD: + cell = xstrdup (df_readable (false, v->total, buf, + v->input_units, v->output_units)); + break; + + case USED_FIELD: + case IUSED_FIELD: + cell = xstrdup (df_readable (v->negate_used, v->used, buf, + v->input_units, v->output_units)); + break; + + case AVAIL_FIELD: + case IAVAIL_FIELD: + cell = xstrdup (df_readable (v->negate_available, v->available, buf, + v->input_units, v->output_units)); + break; + + case PCENT_FIELD: + case IPCENT_FIELD: + { + double pct = -1; + if (! known_value (v->used) || ! known_value (v->available)) + ; + else if (!v->negate_used + && v->used <= TYPE_MAXIMUM (uintmax_t) / 100 + && v->used + v->available != 0 + && (v->used + v->available < v->used) + == v->negate_available) + { + uintmax_t u100 = v->used * 100; + uintmax_t nonroot_total = v->used + v->available; + pct = u100 / nonroot_total + (u100 % nonroot_total != 0); + } + else + { + /* The calculation cannot be done easily with integer + arithmetic. Fall back on floating point. This can suffer + from minor rounding errors, but doing it exactly requires + multiple precision arithmetic, and it's not worth the + aggravation. */ + double u = v->negate_used ? - (double) - v->used : v->used; + double a = v->negate_available + ? - (double) - v->available : v->available; + double nonroot_total = u + a; + if (nonroot_total) + { + long int lipct = pct = u * 100 / nonroot_total; + double ipct = lipct; + + /* Like 'pct = ceil (dpct);', but avoid ceil so that + the math library needn't be linked. */ + if (ipct - 1 < pct && pct <= ipct + 1) + pct = ipct + (ipct < pct); + } + } + + if (0 <= pct) + { + if (asprintf (&cell, "%.0f%%", pct) == -1) + cell = NULL; + } + else + cell = strdup ("-"); + + if (!cell) + xalloc_die (); + + break; + } + + case FILE_FIELD: + cell = xstrdup (file); + break; + + case TARGET_FIELD: +#ifdef HIDE_AUTOMOUNT_PREFIX + /* Don't print the first directory name in MOUNT_POINT if it's an + artifact of an automounter. This is a bit too aggressive to be + the default. */ + if (STRNCMP_LIT (mount_point, "/auto/") == 0) + mount_point += 5; + else if (STRNCMP_LIT (mount_point, "/tmp_mnt/") == 0) + mount_point += 8; +#endif + cell = xstrdup (mount_point); + break; + + default: + assert (!"unhandled field"); + } + + if (!cell) + assert (!"empty cell"); + + replace_problematic_chars (cell); + size_t cell_width = mbswidth (cell, 0); + columns[col]->width = MAX (columns[col]->width, cell_width); + table[nrows - 1][col] = cell; + } + free (dev_name); +} + +/* Scan the mount list returning the _last_ device found for MOUNT. + NULL is returned if MOUNT not found. The result is malloced. */ +static char * +last_device_for_mount (char const* mount) +{ + struct mount_entry const *me; + struct mount_entry const *le = NULL; + + for (me = mount_list; me; me = me->me_next) + { + if (STREQ (me->me_mountdir, mount)) + le = me; + } + + if (le) + { + char *devname = le->me_devname; + char *canon_dev = canonicalize_file_name (devname); + if (canon_dev && IS_ABSOLUTE_FILE_NAME (canon_dev)) + return canon_dev; + free (canon_dev); + return xstrdup (le->me_devname); + } + else + return NULL; +} + +/* If DISK corresponds to a mount point, show its usage + and return true. Otherwise, return false. */ +static bool +get_disk (char const *disk) +{ + struct mount_entry const *me; + struct mount_entry const *best_match = NULL; + bool best_match_accessible = false; + bool eclipsed_device = false; + char const *file = disk; + + char *resolved = canonicalize_file_name (disk); + if (resolved && IS_ABSOLUTE_FILE_NAME (resolved)) + disk = resolved; + + size_t best_match_len = SIZE_MAX; + for (me = mount_list; me; me = me->me_next) + { + /* TODO: Should cache canon_dev in the mount_entry struct. */ + char *devname = me->me_devname; + char *canon_dev = canonicalize_file_name (me->me_devname); + if (canon_dev && IS_ABSOLUTE_FILE_NAME (canon_dev)) + devname = canon_dev; + + if (STREQ (disk, devname)) + { + char *last_device = last_device_for_mount (me->me_mountdir); + eclipsed_device = last_device && ! STREQ (last_device, devname); + size_t len = strlen (me->me_mountdir); + + if (! eclipsed_device + && (! best_match_accessible || len < best_match_len)) + { + struct stat disk_stats; + bool this_match_accessible = false; + + if (stat (me->me_mountdir, &disk_stats) == 0) + best_match_accessible = this_match_accessible = true; + + if (this_match_accessible + || (! best_match_accessible && len < best_match_len)) + { + best_match = me; + if (len == 1) /* Traditional root. */ + { + free (last_device); + free (canon_dev); + break; + } + else + best_match_len = len; + } + } + + free (last_device); + } + + free (canon_dev); + } + + free (resolved); + + if (best_match) + { + get_dev (best_match->me_devname, best_match->me_mountdir, file, NULL, + best_match->me_type, best_match->me_dummy, + best_match->me_remote, NULL, false); + return true; + } + else if (eclipsed_device) + { + error (0, 0, _("cannot access %s: over-mounted by another device"), + quoteaf (file)); + exit_status = EXIT_FAILURE; + return true; + } + + return false; +} + +/* Figure out which device file or directory POINT is mounted on + and show its disk usage. + STATP must be the result of 'stat (POINT, STATP)'. */ +static void +get_point (const char *point, const struct stat *statp) +{ + struct stat disk_stats; + struct mount_entry *me; + struct mount_entry const *best_match = NULL; + + /* Calculate the real absolute file name for POINT, and use that to find + the mount point. This avoids statting unavailable mount points, + which can hang df. */ + char *resolved = canonicalize_file_name (point); + if (resolved && resolved[0] == '/') + { + size_t resolved_len = strlen (resolved); + size_t best_match_len = 0; + + for (me = mount_list; me; me = me->me_next) + { + if (!STREQ (me->me_type, "lofs") + && (!best_match || best_match->me_dummy || !me->me_dummy)) + { + size_t len = strlen (me->me_mountdir); + if (best_match_len <= len && len <= resolved_len + && (len == 1 /* root file system */ + || ((len == resolved_len || resolved[len] == '/') + && STREQ_LEN (me->me_mountdir, resolved, len)))) + { + best_match = me; + best_match_len = len; + } + } + } + } + free (resolved); + if (best_match + && (stat (best_match->me_mountdir, &disk_stats) != 0 + || disk_stats.st_dev != statp->st_dev)) + best_match = NULL; + + if (! best_match) + for (me = mount_list; me; me = me->me_next) + { + if (me->me_dev == (dev_t) -1) + { + if (stat (me->me_mountdir, &disk_stats) == 0) + me->me_dev = disk_stats.st_dev; + else + { + /* Report only I/O errors. Other errors might be + caused by shadowed mount points, which means POINT + can't possibly be on this file system. */ + if (errno == EIO) + { + error (0, errno, "%s", quotef (me->me_mountdir)); + exit_status = EXIT_FAILURE; + } + + /* So we won't try and fail repeatedly. */ + me->me_dev = (dev_t) -2; + } + } + + if (statp->st_dev == me->me_dev + && !STREQ (me->me_type, "lofs") + && (!best_match || best_match->me_dummy || !me->me_dummy)) + { + /* Skip bogus mtab entries. */ + if (stat (me->me_mountdir, &disk_stats) != 0 + || disk_stats.st_dev != me->me_dev) + me->me_dev = (dev_t) -2; + else + best_match = me; + } + } + + if (best_match) + get_dev (best_match->me_devname, best_match->me_mountdir, point, point, + best_match->me_type, best_match->me_dummy, best_match->me_remote, + NULL, false); + else + { + /* We couldn't find the mount entry corresponding to POINT. Go ahead and + print as much info as we can; methods that require the device to be + present will fail at a later point. */ + + /* Find the actual mount point. */ + char *mp = find_mount_point (point, statp); + if (mp) + { + get_dev (NULL, mp, point, NULL, NULL, false, false, NULL, false); + free (mp); + } + } +} + +/* Determine what kind of node NAME is and show the disk usage + for it. STATP is the results of 'stat' on NAME. */ + +static void +get_entry (char const *name, struct stat const *statp) +{ + if ((S_ISBLK (statp->st_mode) || S_ISCHR (statp->st_mode)) + && get_disk (name)) + return; + + get_point (name, statp); +} + +/* Show all mounted file systems, except perhaps those that are of + an unselected type or are empty. */ + +static void +get_all_entries (void) +{ + struct mount_entry *me; + + filter_mount_list (show_all_fs); + + for (me = mount_list; me; me = me->me_next) + get_dev (me->me_devname, me->me_mountdir, NULL, NULL, me->me_type, + me->me_dummy, me->me_remote, NULL, true); +} + +/* Add FSTYPE to the list of file system types to display. */ + +static void +add_fs_type (const char *fstype) +{ + struct fs_type_list *fsp; + + fsp = xmalloc (sizeof *fsp); + fsp->fs_name = (char *) fstype; + fsp->fs_next = fs_select_list; + fs_select_list = fsp; +} + +/* Add FSTYPE to the list of file system types to be omitted. */ + +static void +add_excluded_fs_type (const char *fstype) +{ + struct fs_type_list *fsp; + + fsp = xmalloc (sizeof *fsp); + fsp->fs_name = (char *) fstype; + fsp->fs_next = fs_exclude_list; + fs_exclude_list = fsp; +} + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + emit_try_help (); + else + { + printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name); + fputs (_("\ +Show information about the file system on which each FILE resides,\n\ +or all file systems by default.\n\ +"), stdout); + + emit_mandatory_arg_note (); + + /* TRANSLATORS: The thousands and decimal separators are best + adjusted to an appropriate default for your locale. */ + fputs (_("\ + -a, --all include pseudo, duplicate, inaccessible file systems\n\ + -B, --block-size=SIZE scale sizes by SIZE before printing them; e.g.,\n\ + '-BM' prints sizes in units of 1,048,576 bytes;\n\ + see SIZE format below\n\ + -h, --human-readable print sizes in powers of 1024 (e.g., 1023M)\n\ + -H, --si print sizes in powers of 1000 (e.g., 1.1G)\n\ +"), stdout); + fputs (_("\ + -i, --inodes list inode information instead of block usage\n\ + -k like --block-size=1K\n\ + -l, --local limit listing to local file systems\n\ + --no-sync do not invoke sync before getting usage info (default)\ +\n\ +"), stdout); + fputs (_("\ + --output[=FIELD_LIST] use the output format defined by FIELD_LIST,\n\ + or print all fields if FIELD_LIST is omitted.\n\ + -P, --portability use the POSIX output format\n\ + --sync invoke sync before getting usage info\n\ +"), stdout); + fputs (_("\ + --total elide all entries insignificant to available space,\n\ + and produce a grand total\n\ +"), stdout); + fputs (_("\ + -t, --type=TYPE limit listing to file systems of type TYPE\n\ + -T, --print-type print file system type\n\ + -x, --exclude-type=TYPE limit listing to file systems not of type TYPE\n\ + -v (ignored)\n\ +"), stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + emit_blocksize_note ("DF"); + emit_size_note (); + fputs (_("\n\ +FIELD_LIST is a comma-separated list of columns to be included. Valid\n\ +field names are: 'source', 'fstype', 'itotal', 'iused', 'iavail', 'ipcent',\n\ +'size', 'used', 'avail', 'pcent', 'file' and 'target' (see info page).\n\ +"), stdout); + emit_ancillary_info (PROGRAM_NAME); + } + exit (status); +} + +int +main (int argc, char **argv) +{ + struct stat *stats IF_LINT ( = 0); + + initialize_main (&argc, &argv); + set_program_name (argv[0]); + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + fs_select_list = NULL; + fs_exclude_list = NULL; + show_all_fs = false; + show_listed_fs = false; + human_output_opts = -1; + print_type = false; + file_systems_processed = false; + exit_status = EXIT_SUCCESS; + print_grand_total = false; + grand_fsu.fsu_blocksize = 1; + + /* If true, use the POSIX output format. */ + bool posix_format = false; + + const char *msg_mut_excl = _("options %s and %s are mutually exclusive"); + + while (true) + { + int oi = -1; + int c = getopt_long (argc, argv, "aB:iF:hHklmPTt:vx:", long_options, + &oi); + if (c == -1) + break; + + switch (c) + { + case 'a': + show_all_fs = true; + break; + case 'B': + { + enum strtol_error e = human_options (optarg, &human_output_opts, + &output_block_size); + if (e != LONGINT_OK) + xstrtol_fatal (e, oi, c, long_options, optarg); + } + break; + case 'i': + if (header_mode == OUTPUT_MODE) + { + error (0, 0, msg_mut_excl, "-i", "--output"); + usage (EXIT_FAILURE); + } + header_mode = INODES_MODE; + break; + case 'h': + human_output_opts = human_autoscale | human_SI | human_base_1024; + output_block_size = 1; + break; + case 'H': + human_output_opts = human_autoscale | human_SI; + output_block_size = 1; + break; + case 'k': + human_output_opts = 0; + output_block_size = 1024; + break; + case 'l': + show_local_fs = true; + break; + case 'm': /* obsolescent, exists for BSD compatibility */ + human_output_opts = 0; + output_block_size = 1024 * 1024; + break; + case 'T': + if (header_mode == OUTPUT_MODE) + { + error (0, 0, msg_mut_excl, "-T", "--output"); + usage (EXIT_FAILURE); + } + print_type = true; + break; + case 'P': + if (header_mode == OUTPUT_MODE) + { + error (0, 0, msg_mut_excl, "-P", "--output"); + usage (EXIT_FAILURE); + } + posix_format = true; + break; + case SYNC_OPTION: + require_sync = true; + break; + case NO_SYNC_OPTION: + require_sync = false; + break; + + case 'F': + /* Accept -F as a synonym for -t for compatibility with Solaris. */ + case 't': + add_fs_type (optarg); + break; + + case 'v': /* For SysV compatibility. */ + /* ignore */ + break; + case 'x': + add_excluded_fs_type (optarg); + break; + + case OUTPUT_OPTION: + if (header_mode == INODES_MODE) + { + error (0, 0, msg_mut_excl, "-i", "--output"); + usage (EXIT_FAILURE); + } + if (posix_format && header_mode == DEFAULT_MODE) + { + error (0, 0, msg_mut_excl, "-P", "--output"); + usage (EXIT_FAILURE); + } + if (print_type) + { + error (0, 0, msg_mut_excl, "-T", "--output"); + usage (EXIT_FAILURE); + } + header_mode = OUTPUT_MODE; + if (optarg) + decode_output_arg (optarg); + break; + + case TOTAL_OPTION: + print_grand_total = true; + break; + + case_GETOPT_HELP_CHAR; + case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); + + default: + usage (EXIT_FAILURE); + } + } + + if (human_output_opts == -1) + { + if (posix_format) + { + human_output_opts = 0; + output_block_size = (getenv ("POSIXLY_CORRECT") ? 512 : 1024); + } + else + human_options (getenv ("DF_BLOCK_SIZE"), + &human_output_opts, &output_block_size); + } + + if (header_mode == INODES_MODE || header_mode == OUTPUT_MODE) + ; + else if (human_output_opts & human_autoscale) + header_mode = HUMAN_MODE; + else if (posix_format) + header_mode = POSIX_MODE; + + /* Fail if the same file system type was both selected and excluded. */ + { + bool match = false; + struct fs_type_list *fs_incl; + for (fs_incl = fs_select_list; fs_incl; fs_incl = fs_incl->fs_next) + { + struct fs_type_list *fs_excl; + for (fs_excl = fs_exclude_list; fs_excl; fs_excl = fs_excl->fs_next) + { + if (STREQ (fs_incl->fs_name, fs_excl->fs_name)) + { + error (0, 0, + _("file system type %s both selected and excluded"), + quote (fs_incl->fs_name)); + match = true; + break; + } + } + } + if (match) + return EXIT_FAILURE; + } + + assume (0 < optind); + + if (optind < argc) + { + /* stat each of the given entries to make sure any corresponding + partition is automounted. This must be done before reading the + file system table. */ + stats = xnmalloc (argc - optind, sizeof *stats); + for (int i = optind; i < argc; ++i) + { + if (stat (argv[i], &stats[i - optind])) + { + error (0, errno, "%s", quotef (argv[i])); + exit_status = EXIT_FAILURE; + argv[i] = NULL; + } + else if (! S_ISFIFO (stats[i - optind].st_mode)) + { + /* open() is needed to automount in some cases. */ + int fd = open (argv[i], O_RDONLY | O_NOCTTY); + if (0 <= fd) + close (fd); + } + } + } + + mount_list = + read_file_system_list ((fs_select_list != NULL + || fs_exclude_list != NULL + || print_type + || field_data[FSTYPE_FIELD].used + || show_local_fs)); + + if (mount_list == NULL) + { + /* Couldn't read the table of mounted file systems. + Fail if df was invoked with no file name arguments, + or when either of -a, -l, -t or -x is used with file name + arguments. Otherwise, merely give a warning and proceed. */ + int status = 0; + if ( ! (optind < argc) + || (show_all_fs + || show_local_fs + || fs_select_list != NULL + || fs_exclude_list != NULL)) + { + status = EXIT_FAILURE; + } + const char *warning = (status == 0 ? _("Warning: ") : ""); + error (status, errno, "%s%s", warning, + _("cannot read table of mounted file systems")); + } + + if (require_sync) + sync (); + + get_field_list (); + get_header (); + + if (optind < argc) + { + /* Display explicitly requested empty file systems. */ + show_listed_fs = true; + + for (int i = optind; i < argc; ++i) + if (argv[i]) + get_entry (argv[i], &stats[i - optind]); + + IF_LINT (free (stats)); + } + else + get_all_entries (); + + if (file_systems_processed) + { + if (print_grand_total) + get_dev ("total", + (field_data[SOURCE_FIELD].used ? "-" : "total"), + NULL, NULL, NULL, false, false, &grand_fsu, false); + + print_table (); + } + else + { + /* Print the "no FS processed" diagnostic only if there was no preceding + diagnostic, e.g., if all have been excluded. */ + if (exit_status == EXIT_SUCCESS) + die (EXIT_FAILURE, 0, _("no file systems processed")); + } + + IF_LINT (free (columns)); + + return exit_status; +} |