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Lines 20-34
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#include <stdio.h> |
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#include <stdio.h> |
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#include <sys/types.h> |
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#include <sys/types.h> |
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#include <sys/ioctl.h> |
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#include <sys/ioctl.h> |
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#include <sys/utsname.h> |
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#include <assert.h> |
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#include <assert.h> |
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#include "system.h" |
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#include "system.h" |
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#include "extent-scan.h" |
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#include "extent-scan.h" |
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#include "xstrtol.h" |
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#ifndef HAVE_FIEMAP |
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#ifndef HAVE_FIEMAP |
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# include "fiemap.h" |
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# include "fiemap.h" |
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#endif |
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#endif |
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/* Work around Linux kernel issues on BTRFS and EXT4 before 2.6.39. |
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FIXME: remove in 2013, or whenever we're pretty confident |
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that the offending, unpatched kernels are no longer in use. */ |
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static bool |
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extent_need_sync (void) |
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{ |
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static int need_sync = -1; |
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if (need_sync == -1) |
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{ |
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struct utsname name; |
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need_sync = 0; /* No workaround by default. */ |
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#ifdef __linux__ |
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if (uname (&name) != -1 && strncmp (name.release, "2.6.", 4) == 0) |
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{ |
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unsigned long val; |
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if (xstrtoul (name.release + 4, NULL, 10, &val, NULL) == LONGINT_OK) |
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{ |
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if (val < 39) |
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need_sync = 1; |
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} |
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} |
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#endif |
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} |
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return need_sync; |
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} |
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/* Allocate space for struct extent_scan, initialize the entries if |
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/* Allocate space for struct extent_scan, initialize the entries if |
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necessary and return it as the input argument of extent_scan_read(). */ |
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necessary and return it as the input argument of extent_scan_read(). */ |
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extern void |
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extern void |
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Lines 39-44
extent_scan_init (int src_fd, struct extent_scan *scan)
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scan->scan_start = 0; |
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scan->scan_start = 0; |
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scan->initial_scan_failed = false; |
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scan->initial_scan_failed = false; |
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scan->hit_final_extent = false; |
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scan->hit_final_extent = false; |
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scan->fm_flags = extent_need_sync () ? FIEMAP_FLAG_SYNC : 0; |
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} |
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} |
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#ifdef __linux__ |
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#ifdef __linux__ |
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Lines 62-68
extent_scan_read (struct extent_scan *scan)
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memset (&fiemap_buf, 0, sizeof fiemap_buf); |
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memset (&fiemap_buf, 0, sizeof fiemap_buf); |
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fiemap->fm_start = scan->scan_start; |
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fiemap->fm_start = scan->scan_start; |
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fiemap->fm_flags = FIEMAP_FLAG_SYNC; |
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fiemap->fm_flags = scan->fm_flags; |
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fiemap->fm_extent_count = count; |
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fiemap->fm_extent_count = count; |
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fiemap->fm_length = FIEMAP_MAX_OFFSET - scan->scan_start; |
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fiemap->fm_length = FIEMAP_MAX_OFFSET - scan->scan_start; |
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